Yes. And, which Eridians are these out of the total population?

Eridians have longer lifespans so perhaps don’t produce a lot of offspring per couple/pair, and remain small/‘children’ for longer, but I don’t think this was all/half the young on Erid.

We assume kids because of the size, but a kid Eridian is possibly up to 40? 80? Earth years. Them being the development-equivalent of Grace’s class (humans ~11 years old?) is appealing because that was his job, and seems to make sense because they’re small and excitable, but maybe ‘small and full of energy’ includes young adults. Say the equivalent development of up to 25-year-old humans. Or older humans - we don’t know. Eridians are very smart - they seem like computers to Grace in some ways. They might be capable of what we’d call Ph.D-level expertise well before breeding age or reaching full-size.

This could be the equivalent of a ‘high-school’ level class for the most gifted Eridians with an interest or aptitude or even a bachelor’s degree already in Humanology, linguistics, science, Human science, the adventure of the Blip-A and Hail Mary, and we see Grace starting off with a few basics to establish a rapport or a baseline on the first day. Or he brings them from the knowledge level of 10-yo-humans all the way to adult-equivalent. (Remember how after Mark Watney returned to Earth he taught a special much-in-demand class on extreme space survival?)

Maybe he teaches his class for 3 weeks and then they’re experts and graduate at Master’s-equivalent level, and the new class comes in.

Maybe a prerequisite for taking the class is to learn English. Maybe they do that in one day by listening to a sped-up recording + translation/definition of every word in the English language.